5090 biology paper 2
TRANSCRIPT
This question paper consists of 11 printed pages and 1 blank page.
SP (NF/JB) S20869/2© CIE 2002 [Turn over
CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
BIOLOGY 5090/2PAPER 2
MAY/JUNE SESSION 20021 hour 45 minutes
Additional materials:Answer paper
TIME 1 hour 45 minutes
INSTRUCTIONS TO CANDIDATES
Write your name, Centre number and candidate number in the spaces at the top of this page and on allseparate answer paper used.
Section A
Answer all questions.
Write your answers in the spaces provided on the question paper.
Section B
Answer three questions.
Write your answers on the separate answer paper provided.
At the end of the examination,
1. fasten all separate answer paper securely to the question paper;
2. write an E (for Either) or an O (for Or) next to the number 8 in the grid below to indicate whichquestion you have answered.
INFORMATION FOR CANDIDATES
The intended number of marks is given in brackets [ ] at the end of eachquestion or part question.
You are advised to spend no longer than one hour on Section A and nolonger than 45 minutes on Section B.
CandidateCentre Number Number
Candidate Name
FOR EXAMINER’S USE
Section A
Section B
6
7
8
TOTAL
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Section A
Answer all the questions.
Write your answers in the spaces provided.
1 The arrows in Fig. 1.1 show energy flowing through part of a food chain.
Fig. 1.1
(a) (i) Identify the form of energy indicated at A on Fig. 1.1.
...................................................................................................................................
(ii) State the form in which energy is lost at B and a different form in which energy islost at C.
B .....................................................................................
C .....................................................................................
(iii) State two ways in which the cow can use the energy represented by D in Fig. 1.1.
1. .....................................................................................
2. .....................................................................................[5]
A
B
D
D
C
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(b) (i) State a type of organism that might use the energy lost by the cow at C.
...................................................................................................................................
(ii) Explain how the activity of this type of organism could eventually be of benefit tothe cow.
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...................................................................................................................................[3]
(c) Fig. 1.2 shows a pyramid of biomass.
Fig. 1.2
Explain why the carnivores have the smallest biomass in this pyramid.
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......................................................................................................................................[1]
[Total : 9]
carnivoresherbivores
producers
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2 Fig. 2.1 shows a section through the spinal cord and also some of the muscles and bones ofthe arm (not drawn to the same scale).
Fig. 2.1
(a) On the diagram,
(i) label bones E and F;
(ii) draw in the neurone carrying impulses from the spinal cord to the triceps muscle.[5]
(b) Describe how the structures shown in Fig. 2.1 bring about movement of the arm in thedirection of the arrow.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[3]
(c) Fig. 2.2 shows the legs of an athlete as he starts a race.
Fig. 2.2
J
G
H
I
position 1 position 2
E........................................
........................................F
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(i) Identify, by letter, two extensor muscles in Fig. 2.2.
1. .........................................
2. .........................................
(ii) Suggest which muscles will contract as the athlete’s right leg moves from position 1to position 2.
...................................................................................................................................[4]
[Total : 12]
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3 Fig. 3.1 shows some chemical molecules found in the human body and how they join to formlarger molecules.
Fig. 3.1
(a) Identify molecules K, L and M.
K ...................................................
L ...................................................
M ..................................................[3]
(b) Reaction N occurs in the liver.
(i) Name the complex carbohydrate manufactured by this reaction.
...................................................................................................................................
(ii) Some people develop a disease as a result of which this reaction does not occur.
Name the disease and explain why this reaction does not take place.
disease .............................................
explanation ...............................................................................................................
...................................................................................................................................[4]
K
LM
reaction N
complex carbohydrate
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(c) Complex carbohydrates are digested in the duodenum. Fig. 3.2 shows the effect of pHon the enzyme that controls this reaction.
Fig. 3.2
(i) Name this enzyme. ..............................................................
(ii) Explain how the optimum pH for this enzyme is maintained in the duodenum.
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...................................................................................................................................
...................................................................................................................................[3]
[Total : 10]
rateofreaction
6 7 8 9 10pH
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4 Fig. 4.1 shows a cross-section through a leaf.
Fig. 4.1
(a) Identify parts O and P.
O .......................................................................................
P .......................................................................................[2]
(b) (i) On Fig. 4.1, draw chloroplasts in the cytoplasm of three different types of cell inwhich they are found.
(ii) Name the region of cells that, in most leaves, contains the greatest number ofchloroplasts.
...................................................................................................................................
(iii) State a function of the film of water present on the walls of the cells named in (ii).
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...................................................................................................................................
...................................................................................................................................[5]
O
Q
P
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(c) State two properties of layer Q in Fig. 4.1 and explain the importance of each.
property 1 ........................................................................................
importance .......................................................................................................................
..........................................................................................................................................
property 2 ........................................................................................
importance .......................................................................................................................
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[Total : 11]
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5 Fig. 5.1 summarises the early stages of sexual reproduction in an animal.
Fig. 5.1
(a) (i) Name the type of cells shown at R. ..........................................................................
(ii) Name the process occurring at S. ............................................................................
(iii) Name the type of cell shown at T. ............................................................................[3]
(b) Suggest what happens after stage W in Fig. 5.1 when two genetically identical offspringare produced.
..........................................................................................................................................
......................................................................................................................................[1]
(c) Explain how twins could be
(i) both girls;
...................................................................................................................................
...................................................................................................................................
(ii) one of each sex.
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...................................................................................................................................[4]
[Total : 8]
R
T
S
W
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Section B
Answer three questions.
Question 8 is in the form of an Either/Or question. Only one part should be answered.
Write your answers on the separate answer paper provided.
6 (a) Explain the part played by the cell membrane in the movement of substances into and out ofa cell. [5]
(b) Describe a suitable method for preparing a cell for viewing under a microscope. [5]
[Total : 10]
7 (a) Distinguish between self-pollination and cross-pollination. [4]
(b) With reference to its structural features, describe how pollination occurs in a named insect-pollinated flower. [6]
[Total : 10]
8 Either (a) Explain how structure is related to function in the following parts of the circulatorysystem:
(i) arteries,
(ii) veins.[6]
(b) Explain how a diet high in animal fat may cause coronary heart disease. [4]
[Total : 10]
Or (a) Explain how named excretory substances in the blood are removed by
(i) the lungs,
(ii) the kidneys,
(iii) the skin.[8]
(b) Explain why the loss of oxygen from a leaf of a plant may be described as excretion.[2]
[Total : 10]
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